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Irregular idle

Started by adamwade, November 13, 2004, 09:54:47 AM

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adamwade

OK, from previous threads, I have removed and sort of rebuilt the carb.  I finally got the bike started, but now it idles funny.  Starts beautifully, will idle at 1,200 rpms for a few minutes, then starts going up to around 3500-4000.  I have checked the throttle, throttle body and choke, and they all seem to be fine.  The bike will ride, but when you let off throttle to shift, the rpms will stay high and slowly drop to normal, causes a little jump when shifting.  When the bike idles, and i rev it up, the rpms will stay high, and then slowly drop to normal again.
Life is short...Stay awake for it!!!!

'06 Harley-Davidon FXDB
'99 CBR600 F4  (SOLD!!)
'95 Ninja 250  (SOLD!!)
'91 GS500 (SOLD!!)
'98 FZR600 (SOLD!!)

dgyver

From my experience in trying to solve this problem, by plugging one of the holes in the bottom of each slide keeps the idle from hanging. A lot of will say this is caused by a leans a lean condition.

If you want to come by next weekend, we can drop my plugged slides in and see if that solves your problem. I would be interested to see the difference. Since I am not running a stock engine, my logic may be slightly flawed. I do have another stock motor but it is not setup to run yet. Also, I can balance your carbs as well.
Common sense in not very common.

The Buddha

Yup lean...open air screws... they set to 3 ... BTW you have 40 pilots in it ... if not put 40's, if its 40's open air screws 1/2 turn.
Cool.
Srinath.
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I run a business based on other people's junk.
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adamwade

When I rebuilt the carbs, I made sure I backed the mixture screws out 3 full turns.  (tighten the screw till it is resistant, then backed it out)  I can give  it another 1/2 turn and try it.  I'm not sure of the jet size, I didn't put the jet kit in.  I do know that it is quite a bit larger than the stock main jet that is in another carb I have.
Life is short...Stay awake for it!!!!

'06 Harley-Davidon FXDB
'99 CBR600 F4  (SOLD!!)
'95 Ninja 250  (SOLD!!)
'91 GS500 (SOLD!!)
'98 FZR600 (SOLD!!)

adamwade

dgyver:
I might take you up on that offer!!!  Thanks!
Life is short...Stay awake for it!!!!

'06 Harley-Davidon FXDB
'99 CBR600 F4  (SOLD!!)
'95 Ninja 250  (SOLD!!)
'91 GS500 (SOLD!!)
'98 FZR600 (SOLD!!)

The Buddha

Quote from: adamwadeWhen I rebuilt the carbs, I made sure I backed the mixture screws out 3 full turns.  (tighten the screw till it is resistant, then backed it out)  I can give  it another 1/2 turn and try it.  I'm not sure of the jet size, I didn't put the jet kit in.  I do know that it is quite a bit larger than the stock main jet that is in another carb I have.

Pilot jet, not main jet... You can pretty much open the air screw till it is ~5.5 turns before its likely to fall out...
Cool.
Srinath.
-----------------------------------------------------------------
I run a business based on other people's junk.
-----------------------------------------------------------------

dgyver

Quote from: adamwadedgyver:
I might take you up on that offer!!!  Thanks!
Just let me know. Anytime after 1:30 on Sunday I am free.
Common sense in not very common.

Von Vester

If a carb works fine before opening but doesn't work as well after reassembly then one or two of the small parts may have been left out by accident. There are a lot of little parts (the type that fall off the work bench unnoticed and roll under the shelves) in a carburetor that it can work without but not work well without. If the problem doesn't reveal itself you might consider getting a parts view and taking an inventory of the small parts in the carb.

My '93' ran pretty rough when I bought it. Couldn't find the problem so I took off both carbs and compared the internal parts. I found a small washer missing in the left carb. I bought a new washer ($0.23), and the bike has run flawlessly ever since. I guess the previous owner has a $0.23 washer under the freezer in his garage.
As my Uncle Bilbo used to say, "It's a dangerous thing taking your motorcycle out of the garage. If you don't keep your wits about you there's no telling where you'll be swept off to."

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